'SNL': Seth Rogen Helps Aidy Bryant in Her Promo Debut (Video)

Seth Rogen hosts Saturday Night Live for the third time and he's going to try his hardest not "to phone it in."

The Neighbors star gets some help from Aidy Bryant for his SNL promos. In the promos' highlights, the two fail miserably at improvising their way through a bit, Bryant has a nervous breakdown for her promo debut, Rogen details Neighbors co-star Zac Efron's "muscular" body and Bryant pokes fun at his signature laugh. They also break a big rule for SNL promos.

The musical guest for this weekend's installment is Ed Sheeran, who earlier this weekend premiered his new single "Sing."